Insulator and secondary battery

Abstract

The utility model provides an insulating part and a secondary battery. The insulating part comprises at least two supporting parts, and all the supporting parts are arranged at intervals in the first direction; at least two adjacent supporting parts are connected through at least one connecting part, the height direction of the connecting part is parallel to the second direction, the thickness direction of the connecting part is perpendicular to the second direction, and the height of the connecting part is larger than the thickness of the connecting part; wherein the second direction is perpendicular to the first direction. The utility model solves the problem that the insulating part of the secondary battery in the prior art is easy to extrude the electrode assembly due to expansion deformation.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, specifically, relate to an insulating part and secondary battery. BACKGROUND

[0002] The secondary battery is also called as the rechargeable battery or the storage battery, is the battery that can be activated through the charging mode and continues to use active material after the battery discharges. The electrode assembly and electrolyte are usually arranged in the secondary battery, the electrode assembly includes the tab extending from the end face, the tab is directly connected with the pole of the cover plate of the secondary battery or is indirectly connected with the pole through the adapter piece, so that the current can enter or flow out of the electrode assembly from the outside. At the same time, the cover plate of the secondary battery is generally made of aluminum or steel, which is a good conductor of electricity. In order to prevent the tab or adapter piece from contacting the cover plate and causing short circuit, an insulating part is arranged on the side of the cover plate facing the electrode assembly to achieve insulation between the tab and the adapter piece and the cover plate. Since the electrolyte is arranged in the secondary battery, when the insulating part is soaked in the electrolyte, the insulating part will slowly absorb the electrolyte, thereby expanding the volume of the insulating part itself.

[0003] In the prior art, two positive and negative poles are usually arranged on the cover plate, and the insulating part can be fixed on the cover plate through the poles, for example, clamped and fixed between the poles and the cover plate. When the volume of the insulating part expands, since the distance between the two poles is fixed, the middle part of the insulating part between the two poles tends to deform in the height direction when it expands, and due to the resistance of the cover plate, the middle part of the insulating part will bend towards the electrode assembly, causing the insulating part to press the electrode assembly and causing damage to the pole piece in the electrode assembly.

[0004] Therefore, there is a problem in the prior art that the insulating part of the secondary battery expands and deforms easily and presses the electrode assembly. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide an insulating part and a secondary battery to solve the problem that the insulating part of the secondary battery in the prior art expands and deforms easily and presses the electrode assembly.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, an insulating part is provided, which includes: at least two support parts, all the support parts are arranged at intervals along a first direction; a connecting part, at least two adjacent support parts are connected through at least one connecting part, the height direction of the connecting part is parallel to a second direction, the thickness direction of the connecting part is perpendicular to the second direction, and the height of the connecting part is greater than the thickness of the connecting part; wherein the second direction is perpendicular to the first direction.

[0007] Further, the ratio of the height of the connecting part to the thickness of the connecting part is greater than 1.01.

[0008] Further, the two adjacent support portions have at least two connecting portions, and all the connecting portions are arranged along a third direction.

[0009] Further, the two adjacent support portions have at least two connecting portions, and the at least two connecting portions are symmetrically arranged about a middle line along which the support portions extend in the first direction.

[0010] Further, the connecting portion is in an arc shape or a flat shape with a length direction parallel to the first direction.

[0011] Further, the connecting portion is in an X shape.

[0012] Further, of all the support portions, the two support portions at the two ends in the first direction each have a pole hole.

[0013] Further, the insulating piece includes at least three support portions, and each two adjacent support portions are connected by at least one connecting portion.

[0014] Further, the insulating piece further includes at least one baffle connected with the connecting portion, for isolating the cover plate and the electrode assembly of the secondary battery.

[0015] According to another aspect of the present application, a secondary battery is provided, which includes a cover plate, an electrode assembly, and the above-mentioned insulating piece, and the insulating piece is located on a side of the cover plate facing the electrode assembly.

[0016] By applying the technical scheme of the present application, the insulating piece in the present application includes at least two support portions and connecting portions, and all the support portions are arranged along a first direction; at least two adjacent support portions are connected by at least one connecting portion, the height direction of the connecting portion is parallel to a second direction, the thickness direction of the connecting portion is perpendicular to the second direction, and the height of the connecting portion is greater than the thickness of the connecting portion; wherein the second direction is perpendicular to the first direction.

[0017] When the insulating piece in the present application is applied to a secondary battery, since the insulating piece has support portions, the insulating piece can be fixed to the cover plate of the secondary battery through the support portions corresponding to the poles. When the insulating piece swells due to long-term immersion in electrolyte or under other conditions, since the insulating piece in the present application has connecting portions between the support portions, and the height direction of the connecting portion is parallel to the second direction, the thickness direction of the connecting portion is perpendicular to the second direction, and the height of the connecting portion is greater than the thickness of the connecting portion, the connecting portion is deformed in a direction perpendicular to the second direction, i.e. the connecting portion is deformed in a horizontal direction, at this time, the insulating piece can avoid extruding the electrode assembly, so as to achieve the protection effect on the electrode assembly. Therefore, the insulating piece in the present application solves the problem that the insulating piece of the secondary battery in the prior art swells and deforms easily to extrude the electrode assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the present application serve to provide further understanding of the present application, provide further explanation of the illustrative embodiments of the present application, and serve to explain the present application, and do not constitute any improper limitation to the present application. In the drawings:

[0019] Figure 1 A structure schematic view when the connecting part of the insulating part in the present application has an X-shaped structure is shown;

[0020] Figure 2 A structure schematic view when the connecting part of the insulating part in the present application has an arc-shaped structure is shown;

[0021] Figure 3 A structure schematic view when the insulating part in the present application has a baffle is shown;

[0022] Figure 4 A structure schematic view when the insulating part in the present application has three supporting parts is shown;

[0023] Among them, the above drawings include the following reference signs:

[0024] 10, supporting part; 11, pole hole; 20, connecting part; 30, baffle. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0027] In the present application, unless otherwise specified, the orientation words such as "upper, lower, top, bottom" are generally directed to the direction shown in the drawings, or are directed to the vertical, perpendicular or gravity direction of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0028] In order to solve the problem that the insulating part of the secondary battery is easy to extrude the electrode assembly in the prior art, the present application provides an insulating part and a secondary battery.

[0029] Moreover, the secondary battery in the present application has a cover plate, an electrode assembly and the following insulating part, and the insulating part is located on the side of the cover plate facing the electrode assembly.

[0030] As Figures 1 to 4As shown, the insulating member in this application includes at least two support portions 10 and a connecting portion 20. All support portions 10 are spaced apart along a first direction. At least two adjacent support portions 10 are connected by at least one connecting portion 20. The height direction of the connecting portion 20 is parallel to a second direction, the thickness direction of the connecting portion 20 is perpendicular to the second direction, and the height of the connecting portion 20 is greater than the thickness of the connecting portion 20. The second direction is perpendicular to the first direction.

[0031] When the insulating component of this application is applied to a secondary battery, the insulating component, having a support portion 10, can be fixed to the cover plate of the secondary battery via the support portion 10. When the insulating component expands due to prolonged immersion in electrolyte or under other conditions, the connecting portion 20 between the support portions 10 of the insulating component in this application, with the height direction of the connecting portion 20 parallel to the second direction, the thickness direction of the connecting portion 20 perpendicular to the second direction, and the height of the connecting portion 20 greater than its thickness, causes the connecting portion 20 to preferentially deform in a direction perpendicular to the second direction, i.e., preferentially deform in a horizontal direction. This prevents the insulating component from compressing the electrode assembly, thus protecting the electrode assembly. Therefore, the insulating component of this application solves the problem in the prior art where the expansion and deformation of the insulating component in a secondary battery easily compresses the electrode assembly.

[0032] It should be noted that in this application, when the number of support parts 10 is greater than two, the two support parts 10 corresponding to the pole post can be fixed to the cover plate of the secondary battery, while the other support parts 10 may not be fixedly connected to the cover plate.

[0033] It should be noted that, in this application, the first direction generally refers to Figure 1 The middle Y-axis direction, the second direction generally refers to Figure 1 The Z-axis direction, the third direction generally refers to Figure 1 The X-axis direction. Therefore, in this application, the first direction, the second direction, and the third direction are mutually perpendicular.

[0034] Furthermore, both the support portion 10 and the connecting portion 20 in this application can be plate-shaped. In this application, the plate-shaped support portion 10 is flat, or in other words, the large surface (the surface with the largest area) of the support portion 10 is parallel to the horizontal plane. As for the plate-shaped connecting portion 20, the connecting portion 20 is vertical, or in other words, the large surface of the connecting portion 20 can be parallel to the second direction.

[0035] Optionally, the ratio of the height of the connecting portion 20 to the thickness of the connecting portion 20 is greater than 1.01. By so arranging, since the height of the connecting portion 20 is greater than the thickness, the connecting portion 20 is more likely to deform in the thickness direction. Thus, when the insulating piece absorbs the electrolyte expansion, the connecting portion 20 will not bend towards the electrode assembly direction, but will deform in the direction perpendicular to the Z axis, so that it will not press the electrode assembly, avoiding the damage of the electrode tab inside the electrode assembly.

[0036] Specifically, the two adjacent support portions 10 have at least two connecting portions 20, and all the connecting portions 20 are arranged in the third direction. By so arranging, the stability of the connection between the two support portions 10 can be ensured. Of course, the arrangement of the connecting portions 20 between the two support portions 10 can also be adaptively adjusted in the present application.

[0037] Optionally, the two adjacent support portions 10 have at least two connecting portions 20, and the at least two connecting portions 20 are symmetrically arranged about the middle line of the support portion 10 extending in the first direction. By so arranging, the stability between the two adjacent support portions 10 can be effectively ensured, so that the torsion of the support portion 10 under the action of the connecting portion 20 can be effectively prevented.

[0038] Optionally, the connecting portion 20 is a flat plate, and the length direction of the connecting portion 20 is parallel to the first direction.

[0039] Optionally, the connecting portion 20 is arc-shaped, and the arc-shaped arrangement can easily deform to buffer the expansion. As shown in Figure 2 In one specific embodiment of the present application, the two arc-shaped connecting portions 20 are symmetrically arranged about the middle line of the support portion 10 extending in the first direction.

[0040] As shown in Figure 1 In one specific embodiment of the present application, the two adjacent support portions 10 have X-shaped connecting portions 20. By so arranging, the stability of the connection between the two support portions 10 can be ensured, and the connecting portion 20 can deform in the preset direction, so that the structural stability of the entire insulating piece can be ensured.

[0041] Of course, in the present application, the shape of the connecting portion 20 can also be improved according to the actual design requirements, as long as the connecting portion 20 deforms in the XY plane during the expansion, or in other words, as long as it does not press the electrode assembly.

[0042] Moreover, in the present application, the number of connecting portions 20 between the two support portions 10 can be adaptively adjusted according to the actual design requirements. Or in other words, the number of connecting portions 20 between the two adjacent support portions 10 in the present application can be multiple.

[0043] Optionally, among all the support portions 10, the two support portions 10 located at the two ends of the first direction each have a pole hole 11. By such arrangement, it can be effectively ensured that the insulating piece in the application can be normally used in the secondary battery, and the connecting portion 20 in the insulating piece can be first deformed.

[0044] Optionally, the insulating piece comprises at least three support portions 10, and each adjacent two support portions 10 are connected through at least one connecting portion 20. By arranging the multiple groups of connecting portions 20 (the connecting portions 20 between each adjacent two support portions 10 form a group), the effect of buffering and swelling can be improved while the structural strength of the insulating piece is ensured.

[0045] As shown in Figure 4 In one specific embodiment of the application, the support portion 10 is three, and the middle support portion 10 is connected with the adjacent support portions 10 through two parallel connecting portions 20 at the two ends of the first direction. At this time, the two end support portions 10 have the pole hole 11 and are used for corresponding arrangement with the pole, and the two support portions 10 are fixed with the cover plate of the secondary battery.

[0046] Optionally, as shown in Figure 3 The insulating piece further comprises at least one baffle 30, the baffle 30 is connected with the connecting portion 20 and is used for isolating the cover plate and the electrode assembly of the secondary battery. By arranging the baffle 30, the risk of the cover plate of the secondary battery contacting the electrode assembly through the gap between the support portions 10 can be reduced, and the protection effect on the electrode assembly can be further effectively improved. In this embodiment, the number of connecting portions 20 can be appropriately increased.

[0047] In the application, the baffle 30 and the connecting portion 20 can be perpendicular to each other, or there can be an included angle greater than or equal to 30° and less than 90°.

[0048] From the above description, it can be seen that the embodiments of the application achieve the following technical effects:

[0049] The problem that the insulating piece of the secondary battery is easily pressed against the electrode assembly due to swelling and deformation is effectively solved;

[0050] Obviously, the above-described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the application.

[0051] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0052] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an either chronological or spatial relation. Rather, these terms can be used solely to distinguish a certain specific entity from another entity. It should be understood that the terms so used in the description are interchangeable under appropriate circumstances and embodiments of the application described herein are capable of operating in other sequences than described or illustrated herein.

[0053] The preferred embodiments of the present application have been described above with the specific embodiments. The present application is not limited to the above embodiments. It will be appreciated by those skilled in the art that any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. An insulating component, characterized in that, include: At least two support portions (10), all of which are spaced apart along a first direction; A connecting part (20) is provided, at least two adjacent support parts (10) are connected by at least one connecting part (20), the height direction of the connecting part (20) is parallel to the second direction, the thickness direction of the connecting part (20) is perpendicular to the second direction, and the height of the connecting part (20) is greater than the thickness of the connecting part (20). The second direction is perpendicular to the first direction.

2. The insulating component according to claim 1, characterized in that, The ratio of the height of the connecting part (20) to the thickness of the connecting part (20) is greater than 1.

01.

3. The insulating component according to claim 1, characterized in that, There are at least two connecting parts (20) between two adjacent support parts (10), and all the connecting parts (20) are spaced apart along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

4. The insulating component according to claim 1, characterized in that, There are at least two connecting parts (20) between two adjacent support parts (10), and the at least two connecting parts (20) are symmetrically arranged about the center line extending along the first direction of the support part (10).

5. The insulating component according to claim 1, characterized in that, The connecting part (20) is arc-shaped or the connecting part (20) is a flat plate with its length direction parallel to the first direction.

6. The insulating component according to claim 1, characterized in that, The connecting part (20) is arranged in an X shape.

7. The insulating component according to claim 1, characterized in that, Of all the support portions (10), the two support portions (10) located at both ends of the first direction each have a pole hole (11).

8. The insulating component according to claim 1, characterized in that, The insulating member includes at least three support portions (10), and each pair of adjacent support portions (10) is connected by at least one connecting portion (20).

9. The insulating component according to claim 1, characterized in that, The insulating component also includes at least one baffle (30), which is connected to the connecting portion (20) and is used to isolate the cover plate and electrode assembly of the secondary battery.

10. A secondary battery, characterized in that, It includes a cover plate, an electrode assembly, and an insulating element as described in any one of claims 1 to 9, the insulating element being located on the side of the cover plate facing the electrode assembly.

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